I hate to be the one to have to say this, but why can there not be an Australian Jag. From what I can gather there are some Jags available, not from oversea's lines, ie not originating from Jan Eric's stock. It sound as though they are bred here.
If I remember correctly, there was a while back, a long debate, as Waruikazi mentioned, on a US site in regards to this exact topic. The Americans along with some Europeans, agreed on the fact that there could be animals classed as Australian Jags, here in Oz. These animals are not from the founding stock of Jan Eric, rather animals that have been selectively and line bred to produce animals that can closley resemble the oversea's jags. These are not 3rd and 4th generation Jags that have been out crossed with other morelia subspecies in order to generate the kind of animals that we commonly see such as the reduced Jags, in other sites and occasionally here. They are first or second generation animals, that now have reached the point of being able to be classed and labelled Aust. Jags. Therefore, they are not Illegal imported jags, but infact completly legal australian animals!! The Aust. Jag is it's own morph!